Key-slot cutter



A. T. R YBERG. KEY SLOT CUTTER. .APPL ICATION FILED AUG-22a 1919.

2 SHEETS-SHEET I. 4.9

7 /57. I w a Patented Jan.'4,1921.-

A. T. RYBERG.

KEY SLOT CUTTER. APPLICATION FILED AUG. 22. new.

AXEL THEODOR RYBERG, 0F LANGAA, DENMARK.

KEY-SLOT CUTTER.

Specification of Letters Patent.

"Patented Jan. 4; 1921.

'Application filed-August- 22, 1919. Serial No. 319,109.

To all whom it may concern Be it known that I, AXEL T-HEoDoR-RY- BERG, a subject to the King of Denmark,- and resident of Langaa, Denmark, have invented certain new and useful Improvements in Key-Slot Cutters, of which-the following is a specification.

ertical machines of known construction forcu'tti-ng slots in hubs of different 'machine elements as fly wheels, pulleys, toothed wheels and the like, are constructed'in such a manner that the cutting chisel holder operates above the worktable, a projection from the frame of the machine overhanging the work table being provided'to guide the chisel holder. This projection limits the diameter of the work piece'to be treated in the machine.'

This inconvenience is-very perceptible in such places where parts of machines of many diiferent shapes and sizes are to be worked.

' The present invention comprises a method to eliminate the above described inconvenience and itconsi'sts 'ma'inly inthe work table being placed at the top of'the' machine, in such a manner that only the top end of the chisel'holder'projects througlra hole in the worktable, while all'the other parts of the'machine are arranged below. This arrangementgives the advantage of being able to clamp onto the work tablewhe'els of even the greatest dimensions.

One'm'a'nner of construction of this'invention isshown in the accompanying drawings, in which Figure 1 is a front view of a vertical cut through the slotting machine,

Fig. 2 is the machine seen from the side and partly in section,

Fig. 3 is apartofthe machine in'.horizontal cut"throughtheline A-'AiinF-ig. 2.

Upon theframe 1 of'the machine there is a bearing bracket 2 carryinga horizontal shaft3, the other end of which rests in a bearing 4 uponthe frame, and nearest which it carries a toothed wh'eel 5 that is in engagement with another'toothed wheel 6 upon'a shaft? in "the frame. From the shaft 7 the movement is transferred by means of toothed wheelsS and'9to ashaft'lO, which carries uponthe middle a pinion ll that is in engagement with a rack 12, connected tothe cutting chisel holder 13. Upon'the top part of the frame :the work table 14: isarranged and in the middle of this table is a hole guided at throughw-hich the cutting chisel holder '18 is directed.

The up and down molvement'of the rack 12 and with that the holder 13 is brought about through the described toothed gearing by means of two loosepulleys 15 and 16 uponthe shaft 3. These pulleys are each in tight connection with the half-parts of a claw coupling 17 and 18, between which a claw couplingpart 9 is slidably-but not rota tably arranged upon the shaft 8 and can be i brought into engagement with either'of the claw coupling parts '1'7 or 18. One of the pulley belts is straight, while the other is crossed, sothat the pulleys 15 and 16 will be rotatedupon the shaft in relatively opposite-directions.

Theoperation of the claw coupling 19 is effected in the following manner.

By means of an operating bar 20 fulcrumed upon a stud 21 in the bearing bracket 2, the claw coupling 19 is in connection with a shaft 22 passing through the machine. About at-the middle this shaft is-operated upon-by the one arm 23-of an angle lever, the top end of which arm is forked and catches around the shaft'22between two shoulders 2 1 and 25. Theangle lever turns upon. a stud 26 in a fork 27 clamped to the frame. The other'arm 28 of the angle 'lever is also "forked and catches around a vertical shaft 29 with support against disks 30 and '31 that are spring loaded by means of springs 82 and 33, which are given a suitable tension by means'of check-rings 34 and 35. The -"shaft 29 is the'top and bottom in bearings 36 and 37. A fork38 is attached to the rack 12and catches around'the shaft 29.

Whenthe machine isstarted the'rack 12 will be'moved upward. The fork 38 will be carried up and reaches the collar 39 and pressing'against this causes'the shaft 29to be pressed a little upward, at'the sametime raising'the free end of the angle'lever arm 28, thereby causingthe other angle lever arm 23 to press against'the shoulder 25 and push the shaft 22tothe right'in'Fig. 1. At the same time the operating bar 20 will be turned upon its stud 21 and thereby force the claw coupling '19 out of engagement with the coupling part 18 and into engagement with'the coupling part 17 upon the pulley 15, and this will cause the pulley to'turn the shaft 3, but in the opposite direction, carrying the rack 12 downward. When the rack 12, and with it the chisel holder 13, has wandered the defined distance downward, the fork 38 will reach the collar 40 and press upon it. The shaft 29 will now be carried downward and operating upon the angle lever 28 and the organs 23, 22, 20 the claw coupling 19 is released from its connection with the coupling 17 and is put into engagement with the other coupling 18 upon the pulley 16. The reversing has thus taken place and the rack 12 is moved in the opposite direction and so forth.

The collars 39 and 40 are adjustable in order to be able to vary the movement of the cutting chisel holder 13.

The right end of the shaft 22, Fig. 1, is connected to an operating rod 42, fulcrumed upon a stud 41. This operating rod serves as a starting rod for the operator of the machine.

From Figs. 2 and 3 can be seen how the upand downward-movement of the rack 12 is transferred to the cutting chisel holder 13. The hub, into which a slot is to be cut, is clamped to the work table 14 and the cutting chisel 43 is clamped into its holder by means of a screw 44, the cutting edge turning downward toward the work table. The chisel 13 cuts during the down stroke and is' ineffective during the upward movement. In this manner the strain upon the bolts and clamping irons, which hold the hub to the work table 14, is greatly released. During the chisels movement away from the work table 14 it is automatically held a suitable distance from the bottom of the slot in order that the cutting edge shall not be injured.

Behind the rack 12 (Fig. 3) is arranged a slide 45 guided in the frame 1 and by face plates 46 and 47 in known manner. This slide 45 is provided at the lower side with two ears 48 and 49, between which the chisel holder 13 is placed, fulcrumed on two pivot screws 50 and 51. At the top the slide carries two more ears, of which the one only, 52, is seen in Fig. 2. This lap carries a pin 53 that holds a leaf spring 54 in tension against the chisel holder 13, pressing this to the bottom of the slide 45. At the back of the rack 12 and cast together with this is a projection 55, which passes through an opening in the back wall 56 of the slide 45, projecting a little out from this. Between the chisel holder 13 and the back 56 of the slide 45 a rod 57 is arranged, passing through a hole in the projection 55 and provided on either side of this projection with nuts 58 and 59. The lower end of the rod 57 is carried through a bearing 60 cast in one with the slide 45, and below this hearing the rod is acted upon by a tension spring 61, the tension of which is regulated by a nut 62. The top end of the rod 57 is shaped as a wedge 63 and acts upon a larger, loose wedge 64, which rests against the chisel holder 13. By moving this rod 57 axially in relation to the chisel holder 13, the wedge 63 will cause the top end of the chisel holder 13 to turn a little to the right in Fig. 2, with the pivot screws 50 and 51 as fulcrum, and this takes place when the cutting chisel is being carried away from the work table 14, in order that the cutting edge of the chisel 43 shall not touch the bottom of the slot that is being out. i

Supposing the chisel holder 13 has passed its uppermost position and is now beginning its downward movement. The pinion 11 rotates in the direction indicated by the arrow Fig. 2, and the rack is carried downward. The projection 55 on the rack will press upon the nut 59 and thereby pull the slide 45 and with that the chisel holder 13 down, and the chisel will cut a piece out of the slot. When I the lowest position is reached, the reversing is brought about as described earlier, and the pinion 11 will r0- tate in the direction opposite to that indi cated by the arrow, carrying the chisel holder 13 upward. Simultaneously with the reversing the projection 55 will press upon the upper nut 58 and carry the rod 57 a little upward before the slide 45 accompanies, all in accordance with the tension of the spring 61. The wedge 63 on the end of the rod 57 will hereby be removed a little in relation to the wedge 64, and the leaf spring 54 will press the chisel holder 13 a little back (to the right Fig. 2) andin this manner the cutting chisel will not touch the bottom of the slot.

By regulating the tension of the spring 61 and the upward movement of the wedge 63 in the proper manner, this retrogressive device for the cutting chisel is exceedingly reliable, which has been proved through thorough experiments.

In order to make it possible in an easy and reliable manner to cut a deeper slot in one end of the hub than in the other end thereof, the work table 14 can be given an inclined position at any angle, which can be controlled by means of an index, of known construction.

Any change of the inclination of the work table 14 is brought about by means of a screw 65, Fig. 2, which can be screwed up against the lower side of the work table 14, and thereby lift it, the table turning on handle 71 a suitable turn after each stroke, the work table and the work piece clamped to it, is carried toward the cutting chisel 43, and a new chip is cut off at the bottom of the slot.

1 have shown an embodiment of my invention, but it is clear that changes may be made therein without departing from the spirit thereof as defined in the appended claims.

, \Vhat I claim is:

1. A machine for cutting key slots and the like including a tool biased to a position out of operative relation to the work, means for vibrating said tool, and means actuated by said tool vibrating means for shifting the tool at the beginning of its working stroke and prior to any working movement on the part of the tool into operative engagement with the work.

2. A machine for cutting key slots and the like including a tool biased to a position out of operative contact with the work, a slide carrying said tool, actuating means for said slide, said actuating means being movable relatively to the slide at the ends of the movement of the tool, and means carried by the slide and acting on the tool for moving the same into operative engagement with the work, said last mentioned means being directly coupled to the tool vibrating means whereby such vibrating means will initially act upon the last mentioned means and will subsequently act upon the slide to cause movement of the same together with the tool.

3. A machine for cutting key slots and the like comprising a tool biased to a position out of operative contact with the work, vibrating means for actuating the tool, and coacting wedge elements shifted by said actuating means initially to move the tool at the beginning of the working stroke of said tool into contact with the work.

4. A machine for cutting key slots and the like comprising a reciprocating slide, a tool holder pivoted therein, spring means acting on the tool holder to normally swing the tool out of operative contact with the work, relatively movable wedge elements carried by said slide, tension means for one of said wedge elements, and reciprocating means for the slide acting upon said tensioned wedge elements to initially shift the same relatively to the companion wedge ele ment prior to imparting movement to the slide.

5. A machine for cutting key slots including a slide, a holder pivotally mounted on said slide, a cutter carried by the holder, means for reciprocating the slide and the holder as a unit, a spring urging the holder in one direction to disengage the cutter from the work, coacting wedge elements mounted in the slide and limiting such movement of the holder to maintain the cutter in operative engagement with the work during the reciprocatory movement of the holder in one direction, means actuated by a part of the reciprocating means at the start of the movement of the holder in an opposite direction to shift one of the wedge elements and permit of the pivotal movement of said holder, and the retrocession of the cutter to an inoperative position with respect to the work.

In testimony whereof I aflix my signature in presence of two witnesses.

AXEL THEODOR RYBERG.

Witnesses AUG. SCHLOSSER, T. O. EARBERG. 

